In 1966, a large memorial was constructed to the Jews of Ostrowiec who were killed in the Shoah. There are photos at the following two web pages, but not large enough to read the names. It would be good to have a list of those names available online, either in text or a high-res photo of the monument at Lambton Cemetery:
http://www.etobicokehistorical.com/bais-oilom.html
https://www.jewishgen.org/yizkor/ostrowiec/oste105.html
Mathew Englander